PRODUCTS > Filter presses > With chamber plates > Filtration in the chamber filter press

Animation
Graph
Cycle description





Graph of filtration cycle:




Course of filtration in the chamber filter press:

  • Start of cycle
    the emptied filter press is ready to start a new filtration cycle
  • Closing of the filter press
    the whole set of filtration plates is compressed by means of a hydraulic system, filtration chambers are created between the individual plates.
  • Start of filling
    the suspension is conveyed from a pressure tank; however, a feeding pump is used more often
  • Filling of the filter press
    chambers are filled up with the suspension. Solid particles are being trapped by the filtration cloth, liquid phase passes through the cloth to the plate drainage system.
  • Filtration and formation of the filtration cake
    a layer of solid particles accumulates on the cloth, which increases the filtration resistance. The filling pressure must be increased in order to keep the liquid passing through the cake and the cloth. The rising filtration resistance also results in reduced flow rate of the suspension through the filter press.
  • Achieving of the maximum filling pressure (usually 7 - 15 bar)
    the volume of discharged filtrate is minimum and after some time it remains almost stable. The maximum pressure is maintained for a certain period of time, the required level of the filtration cake dewatering is reached.
  • End of filling
    end of suspension feeding, the feeding pump stops pumping the suspension to the filter press chambers
  • Releasing of pressure
    the pressure inside the chambers is reduced to the level before the start of filtration by opening a valve on the pressure release branch pipe
  • Core blow (optional)
    the residue of unfiltered slurry is pushed out of the suspension feeding channel passing through the whole set of plates, by compressed air.
  • Opening of the filter press
    the hydraulic system releases the compression, the steel plate compressing the set of filtration plates during filtration is shifted away and the individual filtration plates are deflated. During this process the filtration cake is discharged.